ASTM A387 Grade 11 Class 1 pressure vessel steel plate is a chromium-molybdenum alloy steel specially designed for high-temperature and high-pressure service environments.
As a professional steel plate manufacturer and global supplier, GNEE focuses on supplying certified boiler and pressure vessel steels for oil & gas, petrochemical, power generation, and heavy industrial projects worldwide.
ASTM A387 Grade 11 Class 1 pressure vessel steel plate
Within the first 100 words, it is important to clarify that we are not traders. GNEE operates with stable mill resources, strict quality control systems, and large-scale inventory management.
Our ASTM A387 Gr11 Cl1 steel plates are produced strictly according to ASTM standards and can be supplied in normalized, quenched and tempered, or TMCP conditions based on project requirements.
With years of export experience, we help EPC contractors, fabricators, and end users reduce sourcing risk while ensuring compliance with ASME and pressure equipment codes.
ASTM A387 Grade 11 Class 1 Chemical Composition Standard
The chemical composition of ASTM A387 Grade 11 Class 1 steel plate is optimized to deliver excellent creep resistance, oxidation resistance, and weldability under elevated temperatures.
Chemical Composition Table (%)
| Grade | C | Mn | Si | P max | S max |
|---|---|---|---|---|---|
| ASTM A387 Grade 11 Class 1 | 0.04–0.17 | 0.35–0.73 | 0.44–0.86 | 0.035 | 0.035 |
Mechanical Properties of ASTM A387 Grade 11 Class 1 Steel Plate
Reliable mechanical performance is critical for pressure vessels and boilers operating under fluctuating thermal stress.
Mechanical Property Table
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) min | Elongation (%) min | Impact Test Temperature (°C) |
|---|---|---|---|---|
| ASTM A387 Grade 11 Class 1 | 415–585 | 240 | 22 | -20 / -40 / -60 |
Applications of ASTM A387 Grade 11 Class 1 Pressure Vessel Steel Plate
ASTM A387 Grade 11 Class 1 steel plates are widely used in industries requiring high-temperature and pressure resistance.
Typical applications include:
- Pressure vessels and reactors
- Boilers and boiler drums
- Heat exchangers and condensers
- Oil & gas storage tanks
- Petrochemical processing equipment
This grade is particularly suitable for refineries, LNG facilities, and chemical plants where safety and durability are non-negotiable.
ASTM A387 Grade 11 Class 1 Plate Delivery Condition & Inspection Options
To meet different engineering standards, GNEE supplies ASTM A387 Gr11 Cl1 plates with multiple processing and inspection options.
Available delivery conditions:
- AR (As Rolled)
- N (Normalized)
- Q+T (Quenched and Tempered)
- TMCP (Thermo-Mechanical Control Process)
Inspection & testing services:
- Ultrasonic Testing (UT)
- Charpy V-Notch Impact Test
- Z-direction testing (Z15 / Z25 / Z35)
- Third-party inspection (SGS, BV, Lloyd's, etc.)
Surface treatments such as shot blasting, coating, and painting are also available upon request.
ASTM A387 Grade 11 Class 1 Steel Plate Packaging & Supply Capacity
GNEE ensures safe delivery for international projects through standardized export packaging.
Packaging: Seaworthy export packing or customized
Delivery time:
Stock plates: as fast as 7 days
Production orders: 30–50 days
Loading ports: Shanghai, Tianjin, Qingdao
Monthly capacity: 5,000 MT
MOQ: 1 piece
As a trusted manufacturer and exporter, GNEE supplies ASTM A387 Grade 11 Class 1 pressure vessel steel plate with stable quality, full certification, and flexible delivery solutions. Our products are engineered to meet demanding pressure vessel and boiler applications worldwide.
Contact us for the latest ASTM A387 Grade 11 Class 1 pressure vessel steel plate price list, stock availability, and technical support.
Contact us for latest ASTM A387 Grade 11 Class 1 pressure vessel steel plate price list
What is ASTM A387 material?
ASTM A387 GR. 91 CL. 2 Alloy Steel Plates manufactured at the world's finest steel mills, this molybdenum-chrome based alloy has excellent resistance to greater working temperatures, making it the right selection for various applications like in gas, oil, chemical, and power generation.
What is ASTM A387 Grade 11 equivalent to?
ASTM A387 grade 11 equivalent steel is ASME SA387 grade 11. ASTM A387 grade 11 covers A387 grade 11 class 1 and A387 grade 11 class 2, which are equivalent to ASME SA387 grade 11 class 1 and SA387 grade 11 class 2 respectively.
What is the difference between ASTM A182 and A387?
A387 is Plate material. A182 is Forging material. You can refer relevant ASTM Book of standards.
What is ASTM A387?
The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum plates used in the application of welded boilers and pressure vessels subjected to elevated temperatures. The two grades SSAB produces are available as Class 1 and/or Class 2.